
This deer was chomping on apples when it became startled — perhaps by the camera flash, or maybe by the photo-bombing flying squirrel behind it. (Hailey and Logan Lehrer)
In the past 15 years the answers have gotten a lot more accessible, thanks in large part to digital photography. Researchers can now place in remote places cameras with big memory cards and motion sensors. Known as “camera traps,” they snap photos when animals walk by, and they’ve revolutionized the study of wildlife.
In the 30 years since the disaster at Chernobyl, wildlife in the 'Exclusion Zone' has thrived. This video was captured by trap cameras set up by the British "TREE" project between November 2014 and December 2015. (TREE Project)
Shiras’s remote-controlled cameras were bulky and heavy, took only one photo at a time, and their flash was created by an explosion of magnesium powder, Kays said in an interview. Things got better when film came along, he said, but “you were limited to 36 pictures, and then you’d run out of film.”
Today’s digital cameras can store hundreds of images, and they stand up to heat, rain, animal nibbles and invasive insects. As Animalia wrote recently, their images led Georgia-based scientists to conclude that wild animals are spread throughout at least half of the Chernobyl Exclusion Zone. Kays said they also helped him discover in Panama that the seeds buried by small rodents called agoutis were frequently stolen by other rodents, then stolen back by agoutis.
“A picture tells a thousand words,” said Kays, who shared some of the images from the book. “Maybe a picture is worth a thousand data points, in this case.”
Camera trap images have also helped tiger researchers, who can tell individual animals apart by their different stripe patterns, know more about the big cats’ small population and how much prey they need to survive, Kays said. “That’s been critical to tiger conservation,” he said.

A female giant sable antelope passes close to the camera as her herd mates kneel to eat clay from a salt lick in Cangandala National Park, Angola. (Pedro Vaz Pinto)

Rock Creek Park sits in the middle of residential areas of Washington, D.C., where lots of cats reside. But a camera trap survey of the park turned up only this one photo of a cat — and 126 of coyotes. (eMammal)
“We definitely get predators with prey in their mouths, and I think that’s pretty cool,” Kays said.
Here are a few more photos from Kays' book:

A young giant anteater rides on its mother in the Brazilian Pantanal. Females carry their young for six to nine months, or until they are about half her size. (LFB Oliveira, GS Hofmann & IP Coelho)

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